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  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (3)
  • STRUCTURAL MECHANICS  (1)
  • barley  (1)
  • 1990-1994  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to Russian wheat aphid in barley (1992)
    Springer
    Euphytica 62 (1992), S. 213-217 
    Details
    ISSN: 1573-5060
    Keywords: Russian wheat aphid ; Diuraphis noxia ; barley ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The inheritance of resistance to Russian wheat aphid Diuraphis noxia (Mordvilko), in two resistant barleys, Hordeum vulgare L., ASE/2CM//B76BB and ‘Gloria/Come’, was studied in the field and in the greenhouse. The resistant genotypes were crossed with susceptible genotypes ‘Esperanza’ and ‘Shyri’. Resistance reactions of F1, BC1, and F2 plants, and individual F2 plant derived F3 families indicated that resistance in each genotype was controlled by the same single dominant gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041755
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    Paper (German National Licenses)
    Fulltext
  • 2
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    External tank space debris considerations (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Orbital debris issues associated with maintaining a Space Shuttle External Tank (ET) on orbit are presented. The first issue is to ensure that the ET does not become a danger to other spacecraft by generating space debris, and the second is to protect the pressurized ET from penetration by space debris or meteoroids. Tests on shield designs for penetration resistance showed that when utilized with an adequate bumper, thermal protection system foam on the ET is effective in preventing penetration.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 92-1411
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    TSS tether cable meteoroid/orbital debris damage analysis (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report summarizes the damage analyses performed on the tether cable used for the tethered satellite system (TSS), for the damage that could be caused by meteoroid or orbital debris impacts. The TSS consists of a tethered satellite deployer and a tethered satellite. The analytical studies were performed at Marshall Space Flight Center (MSFC) with the results from the following tests: (1) hypervelocity impact tests to determine the 'critical' meteoroid particle diameter, i.e., the maximum size of a meteoroid particle which can impact the tether cable without causing 'failure'; (2) electrical resistance tests on the damaged and undamaged tether cable to determine if degradation of current flow occurred through the damaged tether cables; and (3) tensile load tests to verify the load carrying capability of the damaged tether cables. Finally, the HULL hydrodynamic computer code was used to simulate the hypervelocity impact of the tether cable by particles at velocities higher than can be tested, to determine the extent of the expected tether damage.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-108404 , NAS 1.15:108404
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Preliminary design of a meteoroid/orbital debris shield system for a Mars mission spacecraft (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A preliminary design of a spacecraft shield system to defeat meteoroids and orbital debris during a Mars mission is presented. The mission scenario is first defined in terms of stage times which include LEO, transit, low-Mars orbit, and Mars surface periods. The environment definitions for earth-orbital space debris, planetary meteoroids, and interplanetary meteoroids are next introduced. Shield system design approaches incorporate stochastic simulation, hydrocode analyses, hypervelocity impact testing, and optimization techniques. Structural design trades presented include spacecraft configuration, mission schedule, penetration risk, and total standoff distance between the bumper and wall.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 92-1406
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Large deflection random response of flat and blade stiffened carbon-carbon panels (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The large deflection random response of flat and blade-stiffened carbon-carbon panels is studied both experimentally and analytically. The experimental data was obtained from tests performed in the Thermal Acoustic Fatigue Apparatus at NASA Langley. The analytical results were generated using a numerical simulation program that used the measured acoustic pressure as input. Comparisons of the measured and simulated power spectral densities are presented for several locations on each panel. A comparison of the rms strains at various locations on each panel is also discussed. The measured rms strains were generally a factor of two larger than the predicted. The effect of the nonlinearity was overpredicted at higher sound spectrum levels.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 92-2390 , AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Apr 13, 1992 - Apr 15, 1992; Dallas, TX; United States
    Format: text
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